There are five bags of melon seeds, four of which contain 500g each, and the other contains 600g. The worker who holds melon seeds forgot to mark them. Can you help him use the balance

There are five bags of melon seeds, four of which contain 500g each, and the other contains 600g. The worker who holds melon seeds forgot to mark them. Can you help him use the balance

Divide him into two parts, two points and one point, and weigh the two parts and two points equally. Then one point is 600
If it's not the same weight, divide the heavier two into two parts, which one is 600

A bag of melon seeds weighs 500 grams, eating 20% of the total weight, and then eating the remaining 20% of the weight, leaving melon seeds___ Gram

500 × 20% = 100 (g) (500-100) × 20% = 400 × 20% = 80 (g) 500-100-80 = 320 (g) a: there are 320 grams of melon seeds left

There are five bags of melon seeds, four of which contain 500g each, and the other contains 600g. The workers forgot to mark them
Can you help him find out with the scales?

Twice
For the first time, put two bags on each side of the balance. If both sides are equal, the other bag is 600 grams. If not, continue to weigh the heavy side
The second time, the first two bags were placed on both sides of the balance, can find the weight of 600 grams on one side

A-C=27 C-B=?

C-B= 45 -27 =18